P.S. "ifconfig -a" showed eth1, so I manually configured it with IP/broadcast/mask and that worked. However, this means that I cannot use the snapshot (and I tried creating it twice) for automatic deployment.

I would get in touch with DO's support department directly. I've not had any issues with snapshots or backups missing configurations, so it could simply be a blip in the system, or it could be a more widespread failure during the restoration. Either way, they should be able to help you directly via ticket,

Thanks. Up until yesterday I have also not experienced any problems, having created and restored numerous snapshots of Centos 6. This is the first time (and, as luck would have it, a snapshot of the most configured and complete system) that the network configuration wasn't properly restored.

For those who happen to come across this issue, follows are some basic steps to configure networking:

1) run "ifconfig -a"
1a) take note of the available "eth" interface and of its HWaddr (MAC) address
2) go to "/etc/sysconfig/network-scripts" and check for "ifcfg-ethX" (where X is the interface number from 0 to n) script.
2a) it exists but the number does not match the "eth" interface that you got from step 1a), then rename it to "ifcfg-eth[proper interface number]", edit the file and replace the information inside (DEVICE, HWADDR, IPADDR, NETMASK and GATEWAY fields".
2a) if it doesn't exist, then create it with the following content:

DEVICE="eth[proper interface number]"
HWADDR=XX:XX:XX:XX:XX:XX
IPADDR=192.XX.XX.XX
BOOTPROTO=none
ONBOOT="yes"
DNS1=8.8.8.8
NETMASK=255.255.255.0
GATEWAY=192.XX.XX.XX
PREFIX=24
TYPE=Ethernet
NM_CONTROLLED="yes"

3) reboot and profit.